import { extend } from '../../core/util';
import Common from './Projection';
import Coordinate from '../Coordinate';
import { BaiduSphere } from '../measurer';

/**
 * Projection used by [Baidu Map]{@link http://map.baidu.com}
 * @class
 * @category geo
 * @protected
 * @memberOf projection
 * @name BAIDU
 * @mixes projection.Common
 * @mixes measurer.BaiduSphere
 */
export default extend({}, Common, /** @lends projection.BAIDU */ {
    /**
     * "BAIDU", Code of the projection
     * @type {String}
     * @constant
     */
    code: 'BAIDU',

    project: function (p, out) {
        return this.convertLL2MC(p, out);
    },

    unproject: function (p, out) {
        return this.convertMC2LL(p, out);
    }
}, BaiduSphere, {
    EARTHRADIUS: 6370996.81,
    MCBAND: [12890594.86, 8362377.87, 5591021, 3481989.83, 1678043.12, 0],
    LLBAND: [75, 60, 45, 30, 15, 0],
    MC2LL: [
        [1.410526172116255e-8, 0.00000898305509648872, -1.9939833816331, 200.9824383106796, -187.2403703815547, 91.6087516669843, -23.38765649603339, 2.57121317296198, -0.03801003308653, 17337981.2],
        [-7.435856389565537e-9, 0.000008983055097726239, -0.78625201886289, 96.32687599759846, -1.85204757529826, -59.36935905485877, 47.40033549296737, -16.50741931063887, 2.28786674699375, 10260144.86],
        [-3.030883460898826e-8, 0.00000898305509983578, 0.30071316287616, 59.74293618442277, 7.357984074871, -25.38371002664745, 13.45380521110908, -3.29883767235584, 0.32710905363475, 6856817.37],
        [-1.981981304930552e-8, 0.000008983055099779535, 0.03278182852591, 40.31678527705744, 0.65659298677277, -4.44255534477492, 0.85341911805263, 0.12923347998204, -0.04625736007561, 4482777.06],
        [3.09191371068437e-9, 0.000008983055096812155, 0.00006995724062, 23.10934304144901, -0.00023663490511, -0.6321817810242, -0.00663494467273, 0.03430082397953, -0.00466043876332, 2555164.4],
        [2.890871144776878e-9, 0.000008983055095805407, -3.068298e-8, 7.47137025468032, -0.00000353937994, -0.02145144861037, -0.00001234426596, 0.00010322952773, -0.00000323890364, 826088.5]
    ],
    LL2MC: [
        [-0.0015702102444, 111320.7020616939, 1704480524535203, -10338987376042340, 26112667856603880, -35149669176653700, 26595700718403920, -10725012454188240, 1800819912950474, 82.5],
        [0.0008277824516172526, 111320.7020463578, 647795574.6671607, -4082003173.641316, 10774905663.51142, -15171875531.51559, 12053065338.62167, -5124939663.577472, 913311935.9512032, 67.5],
        [0.00337398766765, 111320.7020202162, 4481351.045890365, -23393751.19931662, 79682215.47186455, -115964993.2797253, 97236711.15602145, -43661946.33752821, 8477230.501135234, 52.5],
        [0.00220636496208, 111320.7020209128, 51751.86112841131, 3796837.749470245, 992013.7397791013, -1221952.21711287, 1340652.697009075, -620943.6990984312, 144416.9293806241, 37.5],
        [-0.0003441963504368392, 111320.7020576856, 278.2353980772752, 2485758.690035394, 6070.750963243378, 54821.18345352118, 9540.606633304236, -2710.55326746645, 1405.483844121726, 22.5],
        [-0.0003218135878613132, 111320.7020701615, 0.00369383431289, 823725.6402795718, 0.46104986909093, 2351.343141331292, 1.58060784298199, 8.77738589078284, 0.37238884252424, 7.45]
    ],

    convertMC2LL: function (cB, out) {
        let cE;
        for (let cD = 0, len = this.MCBAND.length; cD < len; cD++) {
            if (Math.abs(cB.y) >= this.MCBAND[cD]) {
                cE = this.MC2LL[cD];
                break;
            }
        }
        const T = this.convertor(cB, cE, out);
        return T;
    },
    convertLL2MC: function (T, out) {
        let cD, cC, len;
        T.x = this.getLoop(T.x, -180, 180);
        T.y = this.getRange(T.y, -74, 74);
        const cB = new Coordinate(T.x, T.y);
        for (cC = 0, len = this.LLBAND.length; cC < len; cC++) {
            if (cB.y >= this.LLBAND[cC]) {
                cD = this.LL2MC[cC];
                break;
            }
        }
        if (!cD) {
            for (cC = this.LLBAND.length - 1; cC >= 0; cC--) {
                if (cB.y <= -this.LLBAND[cC]) {
                    cD = this.LL2MC[cC];
                    break;
                }
            }
        }
        const cE = this.convertor(T, cD, out);
        return cE;
    },
    convertor: function (cC, cD, out) {
        if (!cC || !cD) {
            return null;
        }
        let T = cD[0] + cD[1] * Math.abs(cC.x);
        const cB = Math.abs(cC.y) / cD[9];
        let cE = cD[2] + cD[3] * cB + cD[4] * cB * cB +
            cD[5] * cB * cB * cB + cD[6] * cB * cB * cB * cB +
            cD[7] * cB * cB * cB * cB * cB +
            cD[8] * cB * cB * cB * cB * cB * cB;
        T *= (cC.x < 0 ? -1 : 1);
        cE *= (cC.y < 0 ? -1 : 1);
        if (out) {
            out.x = T;
            out.y = cE;
            return out;
        }
        return new Coordinate(T, cE);
    },
    toRadians: function (T) {
        return Math.PI * T / 180;
    },
    toDegrees: function (T) {
        return (180 * T) / Math.PI;
    },
    getRange: function (cC, cB, T) {
        if (cB != null) {
            cC = Math.max(cC, cB);
        }
        if (T != null) {
            cC = Math.min(cC, T);
        }
        return cC;
    },
    getLoop: function (cC, cB, T) {
        if (cC === Infinity) {
            return T;
        } else if (cC === -Infinity) {
            return cB;
        }
        while (cC > T) {
            cC -= T - cB;
        }
        while (cC < cB) {
            cC += T - cB;
        }
        return cC;
    }
});
